Zesto Audio Bia 200 Select Stereo Power Amplifier | NEWS

At PTA we live for new amplifiers, so when the news was announced that Zesto Audio was introducing their new Bia 200 Select Stereo Power Amplifier the writing (and editing) team was overjoyed, and ready to war-it-out over who was to be the lucky one to review it. Results of that battle are yet to be determined, but it’s quickly taking a turn for the brutal and personal.

The Bia 200 Select Stereo Power Amp price retails for US $14,800 USD. Shipping and taxes are additional. All Zesto Audio products are sold thru authorized dealers. Please visit their website for detailed product specifications. More photos and the press release are enclosed below.

FYI, In Greek Mythology “Bia” is the Titan Goddess of force, strength and power. The origin of the word “bias” comes the Goddess Bia who sided with Zeus in the Titan war.


Bia 200 Select Stereo Power Amplifier

Thousand Oaks, CA, January 10, 2022 – Zesto Audio is proud to announce the launch of their new Bia 200 Select Stereo Power Amplifier. This amp has 100 watts per channel of dynamic Class A power, plus one of the most unique features in a tube power amp, a 3 position “Auto Bias Select switch”. The Bia 200 ships with KT150 output tubes, but has the auto bias that can accommodate KT88, KT120 and KT170.

George Counnas, President and Chief Design Engineer of Zesto Audio says, “I wanted to redesign the Bia to include KT150 or KT170 output tubes, which were not available in 2012 for the original Bia.” George says what inspired the Bias Select switch is, “I preferred the open sound of the KT150 and KT170’s when they are not at maximum power for my Jazz, but then again I really liked the full power for my Rock & Roll and sometimes it worked the other way. Once I figured out the adjustable power, I realized I could also make it work for readily available tubes like KT88 and KT120.”

George admits, “My challenge in designing an amp is power with finesse. What I mean is capturing the raw power of the crescendo of an orchestra and the solo of a piccolo. I’m very proud of the sound and authority of this amp.”

George said, “I design for the audio enthusiast who likes to have options. It’s safe and easy to use, you don’t need to be an engineer to use my products.”

The Bias Select Switch

This switch provides 3 perfect auto bias settings for 4 different output tubes; KT88, KT120, KT150 & KT170. The Bias Select switch is safe and easy to use, and you can change on the “Fly” so you can hear the difference.

It’s designed for flexibility and sonic customization of an audio system.

Here’s a Summary of What’s New

  • 100 watts per channel
  • Bias Select switch for 3 perfect bias settings for 4 different output tubes
  • Bias Select switch is safe and easy to use, change on the “Fly” so you can hear the difference
  • New tubes using KT150, but can also accommodate KT88, KT120 & KT170
  • New circuit design and grounding scheme
  • New Power supply design with larger mains Toroid
  • A more lively, dynamic musical sound

The Bia 200 Select Has Options

  • RCA or true floating transformer balanced XLR connectors
  • 2 independent ground switches to eliminate hum
  • 3 different taps, 4 Ohm, 8 Ohm and 16 Ohm to better match your speakers

George Counnas is the founder, president, and design engineer for Zesto Audio. He has loved music all his life and went from a musician, to an electronics engineer, to an audio engineer. As a young man in England, he worked for DECCA Navigator (now Raytheon), at the time Britain’s largest electronics company, as part of the research and development team designing airborne navigational systems for the Royal Air Force. George brings to Zesto Audio the unique set of talents of not only designing, creating, and manufacturing the highest build quality of high-end electronic equipment, but also as an audio engineer, he knows how great music should sound.

Zesto Audio was established in 2010 in Thousand Oaks, California. Zesto Audio is a manufacturer of fine analog audio electronics, specializing in modern vacuum tube technology for the 21st century listener. Their award winning products include the Andros II, Andros Deluxe II and the Andros Tèssera Reference Phonostages, the Andros Allasso Step Up Transformer, the Leto Ultra II Line Amp, the Bia 200 Select Stereo Power Amp, and the Eros 300 Monoblocks.

All Zesto Audio products are “Made in the USA”

AXPONA 2019 Zesto